<template>
	<div class="todo-header">
		<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add" />
	</div>
</template>

<script>
	import {nanoid} from 'nanoid'
	export default {
		name: 'ToDo-Top',
		data() {
			return {
				title: ''
			}
		},
		methods: {
			add() {
				//校验数据
				if(!this.title.trim()) return alert('输入不能为空')
				//将用户的输入包装成为一个todo对象
				const todoObj = {
					id: nanoid(),
					title: this.title,
					done: false
				}
				//通知App组件去添加一个todo对象
				this.$emit('addTodo',todoObj)
				//清空输入
				this.title = ''
			}
		},
	}
</script>

<style>
	.todo-header input {
		width: 560px;
		height: 28px;
		font-size: 14px;
		border: 1px solid #ccc;
		border-radius: 4px;
		padding: 4px 7px;
	}

	.todo-header input:focus {
		outline: none;
		border-color: rgba(82, 168, 236, 0.8);
		box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
	}
</style>
